Soldering iron



FIG. 1 is a top, front and right-side perspective view of a soldering iron showing our new design;

FIG. 2 is a top, rear, and right-side perspective view thereof;

FIG. 3 is a right-side elevational view, the opposite side being a mirror image thereof;

FIG. 4 is a top plan view thereof, the bottom plan view being a mirror image thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a soldering iron, as shown and described. 